Tenoning machine



y 1934. A. SCHROFF 1,956,748

TENONING MACHINE Filed 001;. 27. 1932 2 Sheets-Sheet l May 1, 1934. A. SCHROFF 1,956,748

TEJNONING MACHINE Filed Oct. 27, 1952 2 Sheets-Sheet 2 fi l-i.

//\1veN TOR ll atenteei May 1 1934 pairs TENONING MACMNE Alfons Schroff, Ulm-on-the-Donau, Germany Application October 27, 1932, Serial No. 639,875 In Germany November 5, 1931 7 Claims.

'carry out two operations to produce tenons having a length in excess of 200 millimeters, which are frequently needed. Furthermore, machines of known design involve bulky construction which is unfavorable as to both weight and price, and the arrangement of the working shafts one behind, independently of, the other requires extensive driving elements and makes operative travel very long.

The present invention avoids these drawbacks and makes it possible to out tenons of all lengths in one operation, including lengths that were unattainable hith rto, and to save fifty per cent. in operative travel, which means a higher output. Moreover, the requisite driving forces are smaller,

:owing to the peculiar construction of the machine, and the total structure is simpler. A machine according to the invention insures, therefore, greater economy than all existing machine types of this class.

The objects of the invention are attained by providing that the two working discs of each pair, i. e., the two tools for the upper and lower length of the tenon., may be mutually adjusted so that the surface jointly worked by them is longer or shorter, that is, that their joint working width is greater or smaller. In order to make the two tenon faces, the upper and the lower one, different in length, the upper and lower discs are separately adjustable to the desired width of tenon.

Adjustment of the two working discs of each pair to the desired length of the tenon takes place by placing them in such a mutual position that they will intersect each other more or less with respect to the direction of motion of the tool during the cutting of the tenons, the width of the surfaces jointly worked by them determining the length of the tenons. Since the upper working discs may be adjusted independently of the lower discs as to working width, tenons having on an arm which can be moved about the axis of one of the discs, so that the movable disc, according to the extent of the motion, will be disposed more or less in front of the other whereby the common working width is determined.

Such an adjustment of the working discs by swinging motion affords the added advantage of an extremely simple drive of the indirectly driven disc in so far as the movable shaft will always remain at the same distance from the other shaft directly driven by motor and may be driven from the latter directly by belt.

To produce tenons having surfaces differing in length each arm is separately adjustable, also with respect to the thickness of the tenons and the position of the outer faces thereof, and both arms may further be jointly and uniformly adjusted as to height, which is very advantageous when a tenon of a certain depth is to be out also outside the center.

By way of example, the invention is illustrated in the accompanying drawings, in which Figure 1 is a top view partly in section of the arrangement of the tools and adjusting device; Figs. 2, 3, i and 5, and 6 and 7 explain diagrammatically with the aid of finished tenons the adjustment of the tools to different lengths of tenon; Fig. 8 shows a tenon cut in stagger; and Fig. 9 is a side view, partly in section, of the entire device.

Referring to the drawings, for cutting the tenons a of the work-piece 1) two disclike or sawlike tools c and d are provided in pairs above andv below the path of the work, so that thetwo surfaces of the tenon a to be produced are cut simultaneously. Only one of these pairs is described below, both tools 0 and at being carried by a common arm 6.

According to the invention, the two cutter tools 0 and d can be adjusted relative to one another in such a way that their joint working width differs in size, i. e., corresponds to the tenon length to be produced. For this purpose the disc 11 can be disposed before the other disc 0 so as to intersect the latter with the result that the working surface produced jointly by the two discs c and (1 will diifer in width, as diagrammatically shown in Figs. 2, a, 6. Figs. 3, 5 and 7 show the respective work pieces 2) with the tenons a.

This adjustment is made by swinging the cutter disc (2 about the other disc 0. The greater this inclination, that is, the farther the movable disc d is placed before the other disc 0 and the more it therefore intersects the latter, the shorter will be the length of the tenon.

The working disc 0 has a shaft 1 about which the other disc (2 is moved. The shaft 1 is driven directly from the superposed motor 9 and, by means of a pulley h and belt 2', drives the pulley 7c of the shaft Z of the disc 01, the belt 2 being tensioned by a known tightening device m. Since the driven shaft Z is moved or swung about the driving shaft it will always retain the same distance from the latter and thus permits of plain belt drive.

Adjustment of the tools 0 and d, i. e., motion of the arms e, is effected by the hand wheel 11. which moves the arms 6 by means of worm gears o. The arms e, which carry the tools, are adapted to move up and down with their carriages p in the vertical frame q of the machine. Each of these arms has a shaft j which is simultaneously a motor shaft and driving shaft for the disc 0 and the arms are adapted to swing about the shaft 1.

In order to cut a tenon (1, indicated in Fig. 7, the upper face of which has the length :0 which difiers from the lower length :6 both arms 6 must be movable independently from one another, so that the working width x the two upper cutter discs c and d differs from that of the lower tools 0, (1.

Each arm e can be independently adjusted as to height, or both arms e may be jointly adjusted, which is very desirable when the upper and lower discs 0, d are adjusted to a certain tenon depth and only the tenon a has to be cut higher or lower, as indicated in Fig. 3.

To adjust the two pairs of tools 0 and d as to height, their carriages p can be moved up i and down on the vertical frame q of the machine, adjustment taking place in the usual way by means of the spindles T which may be separately adjusted by means of a removable hand wheel 5 and a worm and worm wheel I.

The hand wheel 8 may be attached to the upper square shaft u and then again to the lower shaft, according to whether the upper or lower tools 0, d are to be adjusted.

Both spindles 1 can be coupled together so as to move both arms e simultaneously and uniformly up and down while their tools 0, d retain the same distance. This coupling may consist, for instance, of two toothed discs 12, one of which-the lower one in the drawingsis firmly connected with its spindle 1' while the upper one is longitudinally displaceable thereon, though connected therewith as to rotation. By means of a hand lever 11; the coupling discs 1) may be brought into engagement so as to cause both spindles 1' to rotate as soon as one of them is moved.

In the example shown the teeth of the coupling discs 12 are formed so as to be brought directly into engagement or coupling position at each rotary or swinging position of the arms c. This can be effected by imparting a relatively small pitch to the engaging toothing of the discs 0.

I claim:

1. A tenoning machine comprising a pair of cutter discs one above and one below the path of the work and means for bringing the said discs of a pair into a position such that the cut of one overlaps the cut of the other in the direction of the path of the Work for adjustment to different tenon lengths.

2. A machine according to claim 1, in which the discs are brought into intersecting position by moving one about the other.

3. A tenoning machine comprising a pair of cutter discs one above and one below the path of the work, one of the said discs being movable with respect to the other to bring both discs of a pair into a position such that the cut of one overlaps the cut of the other in the direction of the path of the work, shafts for the said discs, and arms for carrying the said discs, the said arms being movable about the shaft of one of the said discs.

4. A machine according to claim 3, in which a motor is provided above the shaft about which the disc is moved and which is directly rotated by the said motor for driving by belt the movable shaft.

5. A machine according to claim 3, in which the upper and lower arms are independently movable from one another.

6. A tenoning machine comprising a pair of cutter discs one above and one below the path of the work, one of the said discs being movable with respect to the other of a pair to bring said both discs into a position such that the cut of one overlaps the cut of the other in the direction of the path of the work, shafts for the said discs, arms for carrying the said discs, the said arms being separately movable about the shaft of one of the said discs, and a coupling for jointly adjusting the said arms as to height.

'7. A machine according to claim 6, in which a spindle is provided for adjusting each arm as to height, the said spindles being coaxial and threaded and adapted to be brought into rotary connection by the coupling.

ALFONS SCHROFF. 

